1.

On the basis of data given below, E_(Sc^(3+)//Sc^(2+))^(@)=-0.37V,E_(Mn^(3+)//Mn^(2+))^(@)=+1.57V E_(Cr^(2+)//Cr)^(@)=-0.90V,E_(Cu^(2+)//Cu)^(@)=0.34V which of the following statements is incorrect?

Answer»

`Sc^(3+)` has good stability due to `[Ar]3D^(0)4s^(0)` configuration
`Mn^(3+)` is more stable than `Mn^(2+)`
`CR^(2+)` is reducing in nature.
Copper does not give `H_(2)` on REACTION wwith dil `H_(2)SO_(4)`

Solution :`Mn^(2+)(d^(5))`1 is more stable than `Mn^(3+)(d^(4))`,, thus `E_(Mn^(3+)//Mn^(2+))^(@)=+ve`


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